What Car? Q&A - Introduction

The queries you send us are always many and varied - for example, one man wants to know how a diesel particulate filter and turbocharger works, while another lady wants to know if she can reserve a cherished numberplate in advance.

Someone else wants to know whether used child seats are safe, and another would like to find out what ECU stands for.

We've got answers to these and other questions - just read on to see them.

Tried our advice section?Before you send in an e-mail, you could find the answer you're looking for in our advice section and glossary. Click here to go to our advice section, and here to take a look at the glossary.

Green Car Buyer's GuideWhatcar.com has a dedicated section devoted to environmentally friendly motoring. It covers every aspect of green cars, from how they work to the best models on offer. For more information, click here

Still got a question?Click here to submit your own question, but please be aware that we are inundated with many e-mails daily and can't promise to reply to every one.

What Car? Recommends - let us help you choose your next carIf you're after advice on which car to go for, remember to tell us what your budget is and what your buying priorities are.

Tell us if you're more interested in economy than performance, for instance, what you'll use the car for and how many miles you're likely to cover each year.

Send us a picture of yourself with the people who will be using the car and you could appear in the magazine as well. Help us to help other motorists like you.

Click here to send us a picture and get a selection of cars picked out just for you.

Don't forget, you can also turn to the What Car? Helpdesk with motoring problems or disputes you may have. Click here to e-mail the Helpdesk.